基于变论域模糊PID的血透机温度控制方法  

Temperature control of hemodialysis machine based on variable universe fuzzy PID method

作　　者：曾丽蓓 张海涛 涂亚庆 王飞 ZENG Libei;ZHANG Haitao;TU Yaqing;WANG Fei(Army Logistics University of PLA,Chongqing 401311,China;ChongQing Institute of Engineering,Chongqing 400056,China)

机构地区：[1]中国人民解放军陆军勤务学院,重庆401311 [2]重庆工程学院,重庆400056

出　　处：《自动化与仪器仪表》2019年第11期16-20,共5页Automation & Instrumentation

基　　金：国家自然科学基金(No.61871402);国家重点研发计划(No.018YFB2003900)

摘　　要：血透机温度控制系统属于典型的大惯性、大滞后、非线性特性系统。为降低透析液温度超调量,加快调节速度,建立出血透机温控系统的数学模型,在串级PID控制的基础上提出了一种基于变论域模糊PID的血透机温度控制方法,采用固定的收缩函数使系统论域随着温度实时误差及误差变化率的数值进行动态的收缩扩张,使得控制方法中模糊分级更为精细,从而提高控制性能。Simulink仿真表明,该方法能够显著降低超调量,加速系统温度调节,有效改善血透机温控系统的动态性能。The temperature control system of hemodialysis machine is a typical non-linear system with large inertia and time delay.In order to reduce overshoot and speed up regulation,a mathematical model of temperature control system of hemodialysis machine is established.Based on fuzzy PID control,a temperature control method of hemodialysis machine based on variable universe fuzzy PID is proposed.By introducing the contraction function,the input domain is expanded dynamically with the input value,which makes the fuzzy classification of the input domain more precise and improves the control performance.Simulink simulation shows that the method can greatly reduce the overshoot,accelerate the system temperature regulation,and effectively improve the dynamic performance of the temperature control system.

关 键 词：血透机 温度控制 滞后 串级控制 变论域 模糊PID 

分 类 号：TP273.4[自动化与计算机技术—检测技术与自动化装置]